/* ===================

AX2E (AXESCON XACML 2.0 Engine) is the Java authorization engine, which implements OASIS XACML 2.0 standard.
Copyright (C) 2007 AXESCON LLC

This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.

This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA


Contact: AXESCON LLC - info{at}axescon.com

 =================== */
package axescon.xacml.engine.fn;

import axescon.xacml.api.AbstractFn;
import axescon.xacml.api.Fn;
import axescon.xacml.api.XacmlException;
import axescon.xacml.model.policy.AttributeValue;

import java.util.*;
import java.lang.reflect.Array;

/**
 * @author Date: Sep 28, 2005
 *         Responsibilities:
 */
public abstract class FnSetBase extends AbstractFn implements Fn {


    public FnSetBase() {
    }

    /**
     * @param args
     * @return TreeSet<AttributeValue>
     */
    TreeSet getSet(AttributeValue[] args) {
        return new TreeSet(Arrays.asList(args));
    }


    /**
     * @param set Set<AttributeValue>
     * @return
     */
    AttributeValue[] toArray(Set set) {
        if(set.size()==0)return null;
        ArrayList list =new ArrayList(set);
        return (AttributeValue[]) list.toArray((AttributeValue[])Array.newInstance(list.get(0).getClass(),set.size()));
    }

    AttributeValue[] toArray(List bag) {
        if(bag.size()==0)return null;
        return (AttributeValue[]) new ArrayList(bag).toArray(
                (AttributeValue[])Array.newInstance( bag.get(0).getClass(),bag.size()));
    }

    public int getArgTypeListLength() {
        return 2;
    }

    public void setDataTypes(Class[] dataTypes) throws XacmlException {
        if(dataTypes==null || dataTypes!=null&&dataTypes.length!=1)
            throw new XacmlException("too many args",XacmlException.ERR_CODE_CONFIG_FN_WRONG_ARG_LIST);

        if(dataTypes[0]==null){
            throw new XacmlException("empty data type",XacmlException.ERR_CODE_CONFIG_FN_WRONG_ARG_LIST);
        }

        this.dataTypes = new Class[]{dataTypes[0],dataTypes[0]};
    }

}
